Oral tongue underneath the appearance of the bump under normal circumstances for the sublingual caruncle, disease conditions may be sublingual gland cysts, oral-facial granulomatous disease, etc., specific as follows. 1. Under normal circumstances, there is a small protrusion on the mucous membrane of the floor of the mouth on each side of the tongue ligament, called the sublingual caruncle, which is the common opening of the duct of the submandibular gland and the large duct of the sublingual gland. 2. In case of disease: (1) Cyst of the sublingual gland: the simple type of cyst of the sublingual gland is located in the floor of the mouth, often on one side, and sometimes extends to the opposite side; the larger cysts may lift the tongue, resembling a heavy tongue. (2) Orofacial granulomatosis: a rare group of idiopathic granulomatous disorders confined to the tissues of the mouth and face. Oral manifestations may include hyperplasia of the tongue or the floor of the mouth, which may appear as a double tongue. There may be other reasons for the appearance of bumps underneath the tongue in the oral cavity. If other symptoms occur, it is recommended to go to the hospital and receive professional treatment.